syzbot

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BUG: KCSAN: data-race in __filemap_remove_folio / folio_mapping

write to 0xffffea0004735898 of 8 bytes by task 7694 on cpu 0:
 page_cache_delete mm/filemap.c:144 [inline]
 __filemap_remove_folio+0x1a5/0x2a0 mm/filemap.c:224
 filemap_remove_folio+0x6d/0x1d0 mm/filemap.c:253
 truncate_inode_folio+0x42/0x50 mm/truncate.c:176
 shmem_undo_range+0x244/0xa80 mm/shmem.c:1128
 shmem_fallocate+0x799/0x840 mm/shmem.c:3788
 vfs_fallocate+0x3b3/0x400 fs/open.c:342
 ksys_fallocate fs/open.c:366 [inline]
 __do_sys_fallocate fs/open.c:371 [inline]
 __se_sys_fallocate fs/open.c:369 [inline]
 __x64_sys_fallocate+0x7a/0xd0 fs/open.c:369
 x64_sys_call+0x2514/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:286
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffea0004735898 of 8 bytes by task 7691 on cpu 1:
 folio_mapping+0xa1/0x120 mm/util.c:702
 folio_evictable mm/internal.h:499 [inline]
 move_folios_to_lru+0x128/0x6a0 mm/vmscan.c:1934
 evict_folios+0x3155/0x3520 mm/vmscan.c:4774
 try_to_shrink_lruvec+0x5b5/0x950 mm/vmscan.c:4907
 lru_gen_shrink_lruvec mm/vmscan.c:5056 [inline]
 shrink_lruvec+0x22e/0x1b50 mm/vmscan.c:5815
 shrink_node_memcgs mm/vmscan.c:6051 [inline]
 shrink_node+0x686/0x2120 mm/vmscan.c:6092
 shrink_zones mm/vmscan.c:6336 [inline]
 do_try_to_free_pages+0x3f6/0xcd0 mm/vmscan.c:6398
 try_to_free_mem_cgroup_pages+0x1ab/0x410 mm/vmscan.c:6726
 try_charge_memcg+0x358/0x9e0 mm/memcontrol.c:2357
 obj_cgroup_charge_pages+0xa6/0x150 mm/memcontrol.c:2800
 __memcg_kmem_charge_page+0x9f/0x170 mm/memcontrol.c:2844
 __alloc_frozen_pages_noprof+0x188/0x360 mm/page_alloc.c:5165
 alloc_pages_mpol+0xb3/0x250 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline]
 alloc_pages_noprof+0x90/0x130 mm/mempolicy.c:2507
 vm_area_alloc_pages mm/vmalloc.c:3642 [inline]
 __vmalloc_area_node mm/vmalloc.c:3720 [inline]
 __vmalloc_node_range_noprof+0x6f2/0xe00 mm/vmalloc.c:3893
 __kvmalloc_node_noprof+0x30f/0x4e0 mm/slub.c:5074
 ip_set_alloc+0x1f/0x30 net/netfilter/ipset/ip_set_core.c:261
 hash_netiface_create+0x282/0x740 net/netfilter/ipset/ip_set_hash_gen.h:1568
 ip_set_create+0x3cc/0x960 net/netfilter/ipset/ip_set_core.c:1109
 nfnetlink_rcv_msg+0x4c6/0x590 net/netfilter/nfnetlink.c:302
 netlink_rcv_skb+0x120/0x220 net/netlink/af_netlink.c:2552
 nfnetlink_rcv+0x16b/0x1690 net/netfilter/nfnetlink.c:667
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x5c0/0x690 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x58b/0x6b0 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x145/0x180 net/socket.c:729
 ____sys_sendmsg+0x31e/0x4e0 net/socket.c:2614
 ___sys_sendmsg+0x17b/0x1d0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0xd4/0x160 net/socket.c:2703
 x64_sys_call+0x191e/0x2ff0 arch/x86/include/generated/asm/syscalls_64.h:47
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0x200 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0xffff888135f684d8 -> 0x0000000000000000

Reported by Kernel Concurrency Sanitizer on:
CPU: 1 UID: 0 PID: 7691 Comm: syz.1.1023 Not tainted 6.16.0-syzkaller-11241-g186f3edfdd41 #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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syz.1.1023 (7691) used greatest stack depth: 6056 bytes left